Analytical Industries GPR-1500 A Series Trace PPM Oxygen Analyzer - Manual (Page 27)

Advanced Instruments, Inc
27
Both the Zero Calibrate and Span Calibrate functions result in the following displays:
PASSED CALIBRATION
OR
FAILED CALIBRATION
Default Zero
The feature will eliminate any previous zero calibration adjustment and display the actual signal output of the
sensor with the zero/sample gas. For example, assuming a zero gas is introduced, the display above 0.00
PPM will reflect an actual zero offset. This feature allows the user to ensure that the accumulative zero
offset never exceeds 50% of the lowest range limit. To perform Default Zero,
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
3. Press the ENTER key to select the highlighted menu option.
The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATION
CONFIG ALARMS
BYPASS ALARMS
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
OUTPUT SPAN
OUTPUT ZERO
4. Advance the reverse shade cursor using the ARROW keys to highlight DEFAULT ZERO.
5. Press the ENTER key to select the highlighted menu option.
The following display appears and after 3 seconds the system returns to the SAMPLING mode:
FACTORY
DEFAULTS
SET
3.3 PPM
AUTO SAMPLING
10 PPM RANGE
76 F 100 KPA
Analog Output with Zero O
2
In rare instances the 4-20mA signal output may not agree with the reading displayed on the LCD. This
feature enables the user to adjust the 4mA signal output when the LCD displays 00.00.
Note Adjust the 20mA signal output with the OUTPUT SPAN option described below. To adjust the 4 mA
signal
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.